Are those good interview questions? It's easy to have done many things in web dev, without having touched node, web sockets, or state restoration. I had to look up the last one: Couldn't find much relevant from an internet search. Sounds like dumping frontend state into local storage and/or the app DB maybe, then reversing? TCP would be another way to have full duplex comm over the web; I would have gone for that prior to web sockets.
More to the point: Those are all things that you could go from being unequipped to answer, to answering well quickly from research. So, it sounds like these questions would select for people who have used these technologies and techniques, vice for good developers.
"Couldn't find much relevant from an internet search. Sounds like..."
Maybe that is why AI barfs on it. But, yes, performance is something users universally care very much about even if many businesses aren't willing to accept that, so the question remains highly relevant. Another way a good interviewer, who has a background in performance, to consider this is to start asking performance questions that a candidate could answer from AI and the asking the candidate why some performance techniques work better than others and by how much. Then you can really see if they have a high confidence AI answer that they cannot quality.
At any point, AI answers aren't a challenge for people who are confidence enough in the craft to ask more qualified questions and determine honesty from the resulting nonverbal signals.